I'm not sure if the new QuickBooks Online version works differently than the previous version with regard to using tabs & arrows to navigate fields and choose list items from drop-down menus such as accounts, customers & vendors, classes, etc. Regardless, users of the new QBO have been frustrated by the 'necessity' of taking their hands off of the keyboard and using a mouse to click on the correct drop-down menu item. The solution is simple. You ready for this? It's the down arrow. I know that you are thinking "Um... no, I've tried that 319 times and it doesn't work." But here's the catch -- it's the down arrow TWICE. I presume that the first time you hit the down arrow, you are hovering over the "+ Add ..." option, though you can't tell because the item does not change colors or highlight itself. Hit the down arrow one more time, and you will find yourself scrolling down your list like you are twirling and spinning through a beautiful green meadow on sunny spring day. Once you've highlighted the correct item, you select it by tabbing to the next field. I wouldn't sell your mouse just yet, but this trick certainly lessens the necessity of using it.